Messages in this thread Patch in this message | | | Date | Sat, 14 Jun 2003 04:46:11 -0400 | From | Samuel Thibault <> | Subject | Re: [2.5. PATCH] cpufreq: correct initialization on Intel Coppermines |
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On fri 08 nov 2002 09:30:08 GMT, Dominik Brodowski wrote: > The detection process for speedstep-enabled Pentium III Coppermines is > considered proprietary by Intel.
They seem to have changed their mind:
http://www.intel.com/support/processors/sb/cs-003779-prd24.htm
Which looks a bit like what was implemented at first. Here is a patch. I kept the setup parameter, but it might be removed now?
--- linux-2.5.70-bk12/arch/i386/kernel/cpu/cpufreq/speedstep.c 2003-05-26 21:00:20.000000000 -0400 +++ linux/arch/i386/kernel/cpu/cpufreq/speedstep.c 2003-06-14 04:33:04.000000000 -0400 @@ -503,6 +503,15 @@ if (speedstep_coppermine) return SPEEDSTEP_PROCESSOR_PIII_C; + /* if the processor is a mobile version, + * platform ID has bit 50 set + * it has SpeedStep technology if either + * bit 56 or 57 is set */ + rdmsr(MSR_IA32_PLATFORM_ID, msr_lo, msr_hi); + dprintk(KERN_DEBUG "cpufreq: Coppermine: MSR_IA32_PLATFORM ID is 0x%x, 0x%x\n", msr_lo, msr_hi); + if ((msr_hi & (1<<18)) && (msr_hi & (3<<24))) + return SPEEDSTEP_PROCESSOR_PIII_C; + printk(KERN_INFO "cpufreq: in case this is a SpeedStep-capable Intel Pentium III Coppermine\n"); printk(KERN_INFO "cpufreq: processor, please pass the boot option or module parameter\n"); printk(KERN_INFO "cpufreq: `speedstep_coppermine=1` to the kernel. Thanks!\n"); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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